device any clever maneuver; "he would stoop to any device to win a point"; "it was a great sales gimmick"; "a cheap promotions gimmick for greedy businessmen"
mirror polished surface that forms images by reflecting light
parabolic reflector,
paraboloid reflector a concave reflector used to produce a parallel beam when the source is placed at its focus or to focus an incoming parallel beam
reflector -
optical telescope consisting of a large concave mirror that produces an image that is magnified by the eyepiece; "Isaac Newton invented the reflecting telescope in 1668"
optical telescope an astronomical telescope designed to collect and record light from cosmic sources
cassegrainian telescope,
gregorian telescope a reflecting telescope that has a paraboloidal primary mirror and a hyperboloidal secondary mirror; light is brought to a focus through an aperture in the center of the primary mirror
coude system,
coude telescope a reflecting telescope so constructed that the light is led to a plate holder or spectrograph
